Explanation

The one-step mechanism is known as the E2 reaction,

and the two-step mechanism is known as the E1 reaction.

Explanation

Among suitable choices, certainly, ethanol dehydrogenation to acetaldehyde is desirable CH3CH2OH(g) → CH3CHO(g) + H2(g) ΔH0298 = 68.6 kJ/mol.

This reaction is endothermic and characterized by a reaction enthalpy variation of 68.6 kJ/mol. (Leblud et al., 1981)

ND11-09-023

Explanation

In the case of a suspended heart attack, it is recommended to sit the person in a comfortable position 

This is because sitting upright can help relieve pressure on the chest and make breathing easier.

Additional informationL

Laying down flat may worsen the symptoms and make it harder for the person to breathe.

Encouraging movement may also be dangerous as it can put additional strain on the heart

Explanation

Flower is the reproductive part of a plant.

A flower may be unisexual with either the male or the female reproductive parts.

Explanation

Aristotle was a Greek philosopher. 

Aristotle divided organisms into 3 categories on the basis of their habitat.

AGM 25-12-2022

Explanation

Concept: 

First aid is the provision of initial care for an illness or injury.

It is usually performed by a non-expert on a sick or injured person until appropriate medical treatment can be accessed in a hospital

Explanation:

In case the tongue falls backward, blocking the airway, it is necessary to hyperextend the head and pull up the chin, so that the tongue lifts and clears the airway.

Place one hand on the person's forehead, gently till their head back, and elevate the tip of their chin with 2 fingers to open the airway.

As a result, the tongue is pushed back toward the neck.

Avoid pressing on the mouth's floor as doing so will cause the tongue to rise and restrict the airway.

Explanation

On 21st March and September 23rd, direct rays of the sun fall on the equator.

At this position, neither of the poles is tilted toward the sun;

so, the whole earth experiences equal days and equal nights.

This is called an equinox.

Explanation

According to Newton's third law of motion, air strikes the wings in opposite directions.

When a bird is flying, the bird pushes the air with its feather in the backward direction (action),

and the air, in turn, pushes them forward due to the force of reaction.

Explanation

The maximum displacement from the mean position is called the amplitude

Amplitude is the maximum displacement of a particle from its mean position.

AGM 25-12-2022

Explanation

There are two main kinds of grasslands:

1. tropical 
2. temperate.

Examples of temperate grasslands include:

• Eurasian steppes
• North American prairies
• Argentine pampas

Example of Tropical grasslands include the"

• hot savannas of sub-Saharan Africa and Northern Australia.